title: Smokeless tobacco or nicotine replacement therapy has no effect on serum immunoglobulin levels.
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007136:Immunoglobulins / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009538:Nicotine / Q000627:therapeutic use*; D018722:Nicotinic Agonists / Q000627:therapeutic use*; D012907:Smoking / Q000097:blood*; D014030:Tobacco, Smokeless
chemical_list: D007074:Immunoglobulin G; D007136:Immunoglobulins; D018722:Nicotinic Agonists; D009538:Nicotine